TOPGREENER Countdown Timer Switch - 1-5-10-30-45 Min & 1-2-4 Hour Adjustable Bathroom Timer for Fans, Lights & Ventilation - 600W LED/1/2HP Capacity with Neutral Wire - UL Listed White Wall Switch (TGT08) - Perfect for Bathrooms, Kitchens & Laundry Rooms

I wanted to reduce the amount of mildew and mold growing in the bathroom so I started looking at ways to ensure the exhaust fan runs long enough to pull all the moisture from the air but not stay on all day.I looked at switches and fans with the humidity sensors but read and heard too many complaints about them not being very reliable. Considering how humidity levels in the house can vary quite a bit based on the time of year, I decided not to go this route.Instead, I decided to try a simple approach - use a timer. I spoke a couple contractors in my family about it and the consensus was running a fan for 30 minutes at the start of a shower is usually about right. This switch includes a 30 minute interval but provides a number of other times to accommodate other uses.The installation was no different than most other switches I've ever installed. You'll need a neutral for this switch to work. That wasn't an issue for me.I installed this in our master bath shower area and I've been thrilled with the results. Now my wife and I hit 30 minutes as we get into the shower and let the timer run through. So far I have no complaints at all. I plan on eventually installing two more of these in our other bathrooms.Update:The first timer is still working great a few years later. I have ordered and installed two additional timers for our other bathrooms. I found a new reason to use a timer for bathroom fans - kids! They often leave the fans on which seems like a big waste in winter and summer. No complaints and recommend.